Conservative-leaning Democrats in Pennsylvania are flocking to the Republican Party in droves, and it's helping Donald Trump big-time.

More than 60,000 Democrats from the state have turned to the Republican Party, and many have registered to vote for Trump in Tuesday's upcoming primary.

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The left to right shift completely dwarfs the GOP to Democratic shift. Only 29,000 Republicans have changed sides. President Barack Obama won the state both in 2008 and 2012.

Pennsylvania's 71 GOP delegates make it the crown jewel of states among Tuesday's five primaries, and polls are predicting it'll be a big win for Trump — some polls show Trump with about 50 percent of the vote.

RELATED: See what happened when one recent Trump rally took a violent turn



17 PHOTOS Donald Trump ralley in Bridgeport Connecticut See Gallery Disgruntled Democrats quitting to join GOP in Pennsylvania BRIDGEPORT, CT - APRIL 23: A protester is led out of Republican presidential candidate Donald Trump's rally in Bridgeport on April 23, 2016 in Bridgeport, Connecticut. Under a heavy police presence, the afternoon event was disrupted on a number of occasions by protesters. Despite his advisers pledging that Trump will begin using a more presidential tone in his appearances, in Bridgeport Trump did not use a teleprompter and stuck to his usual style. (Photo by Spencer Platt/Getty Images) BRIDGEPORT, CT - APRIL 23: A protester is led out of Republican presidential candidate Donald Trump's rally in Bridgeport on April 23, 2016 in Bridgeport, Connecticut. Under a heavy police presence, the afternoon event was disrupted on a number of occasions by protesters. Despite his advisers pledging that Trump will begin using a more presidential tone in his appearances, in Bridgeport Trump did not use a teleprompter and stuck to his usual style. (Photo by Spencer Platt/Getty Images) BRIDGEPORT, CT - APRIL 23: A protester is led out of Republican presidential candidate Donald Trump's rally in Bridgeport on April 23, 2016 in Bridgeport, Connecticut. Under a heavy police presence, the afternoon event was disrupted on a number of occasions by protesters. Despite his advisers pledging that Trump will begin using a more presidential tone in his appearances, in Bridgeport Trump did not use a teleprompter and stuck to his usual style. (Photo by Spencer Platt/Getty Images) BRIDGEPORT, CT - APRIL 23: Protesters are led out of Republican presidential candidate Donald Trump's rally in Bridgeport on April 23, 2016 in Bridgeport, Connecticut. Under a heavy police presence, the afternoon event was disrupted on a number of occasions by protesters. Despite his advisers pledging that Trump will begin using a more presidential tone in his appearances, in Bridgeport Trump did not use a teleprompter and stuck to his usual style. (Photo by Spencer Platt/Getty Images) A group of Donald Trump rally attendees walk past Anti-Trump protesters following a campaign rally for Republican U.S. presidential candidate Donald Trump at The Klein Memorial Auditorium in Bridgeport, Connecticut, U.S., April 23, 2016. REUTERS/Andrew Kelly TPX IMAGES OF THE DAY Attendees exit following a campaign rally for Republican U.S. presidential candidate Donald Trump at The Klein Memorial Auditorium in Bridgeport, Connecticut, U.S., April 23, 2016. REUTERS/Andrew Kelly A Donald Trump supporter yells at ant-Trump protesters following a campaign rally for Republican U.S. presidential candidate Donald Trump at The Klein Memorial Auditorium in Bridgeport, Connecticut, U.S., April 23, 2016. REUTERS/Andrew Kelly People wait to enter before a campaign rally for Republican U.S. presidential candidate Donald Trump at The Klein Memorial Auditorium in Bridgeport, Connecticut, U.S., April 23, 2016. REUTERS/Andrew Kelly A child uses his cellular device before a campaign rally for Republican U.S. presidential candidate Donald Trump at The Klein Memorial Auditorium in Bridgeport, Connecticut, U.S., April 23, 2016. REUTERS/Andrew Kelly A Donald Trump supporter takes signs before a campaign rally for Republican U.S. presidential candidate Donald Trump at The Klein Memorial Auditorium in Bridgeport, Connecticut, U.S., April 23, 2016. REUTERS/Andrew Kelly A vendor moves a trolley of Donald Trump paraphernalia before a campaign rally for Republican U.S. presidential candidate Donald Trump at The Klein Memorial Auditorium in Bridgeport, Connecticut, U.S., April 23, 2016. REUTERS/Andrew Kelly TPX IMAGES OF THE DAY Republican U.S. presidential candidate Donald Trump speaks during a campaign rally at The Klein Memorial Auditorium in Bridgeport, Connecticut, U.S., April 23, 2016. REUTERS/Andrew Kelly Republican U.S. presidential candidate Donald Trump speaks during a campaign rally at The Klein Memorial Auditorium in Bridgeport, Connecticut, U.S., April 23, 2016. REUTERS/Andrew Kelly A Donald Trump rally attendee walk past Anti-Trump protesters following a campaign rally for Republican U.S. presidential candidate Donald Trump at The Klein Memorial Auditorium in Bridgeport, Connecticut, U.S., April 23, 2016. REUTERS/Andrew Kelly US Republican presidential candidate Donald Trump speaks at a campaign rally in the Klein Memorial Auditorium in Bridgeport, Connecticut on April 23, 2016. / AFP / TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images) US Republican presidential candidate Donald Trump speaks at a campaign rally in the Klein Memorial Auditorium in Bridgeport, Connecticut on April 23, 2016. / AFP / TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images) BRIDGEPORT, CT - APRIL 23: Republican presidential candidate Donald Trump speaks at a rally in Bridgeport on April 23, 2016 in Bridgeport, Connecticut. Under a heavy police presence, the afternoon event was disrupted on a number of occasions by protesters. Despite his advisers pledging that Trump will begin using a more presidential tone in his appearances, in Bridgeport Trump did not use a teleprompter and stuck to his usual style. (Photo by Spencer Platt/Getty Images) Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

One expert told The Patriot‑News there are likely three reasons for the shift:

Trump's appeal to working-class, blue-collar workers

Democrats who believe the party's moved too far left

Conservatives who've finally decided it was time to disaffiliate.

"The Democrats, even though they have the majority in terms of registration in the state, people do not vote that way," Professor Jerry Shuster of the University of Pittsburgh told KDKA.

A Republican last won Pennsylvania in the general election in 1988.

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