David M Jackson

USA TODAY

A new poll bolsters predictions that Hillary Clinton and Donald Trump are poised for big wins Tuesday in Pennsylvania.

Trump pulls 45% ahead of the Republican primary in the Keystone State, according to the NBC News/Wall Street Journal/Marist poll, well ahead of Ted Cruz (27%) and John Kasich (24%).

Clinton, meanwhile, leads Bernie Sanders by 15 points in the Pennsylvania poll, 55%-40%. Pennsylvania is the biggest of five delegate contests on Tuesday.

NBC News reports that Trump "performs the best among those who strongly support a candidate (getting support from 57% from that group), men (52%), those without a college degree (52%) and those in the Northeast part of the state (52%). He performs the worst among college graduates (37%), women (39%, white evangelicals (40% — but still leading Cruz's 36%) and in the Philadelphia suburbs (38% — leading Kasich's 34%)."

As for the Democratic race, NBC reports:

"Clinton leads among African Americans (67% to 29%), those ages 45 and older (66% to 28%), women (62% to 34%), self-identified Democrats (60% to 36%) and those strongly supporting a candidate (59% to 41%).

"Sanders holds the edge among those who are under 45 (60% to 37%), those who are 'very liberal' (58% to 41%), independents (55% to 39%) and men (49% to 45%)."