The recent and ongoing mass exodus of Republican lawmakers from Congress ahead of the 2018 midterm elections has given Democrats a critical opening to take back key districts. In the past several months, Republicans have been departing Capitol Hill in droves, with more than 30 members announcing their retirement, run for another office, or already resigned. That’s more than double the number of Democratic exits in the same time period.

The outgoing range from long-serving senior Republican leadership like Rep. John Duncan John James DuncanLamar Alexander's exit marks end of an era in evolving Tennessee Tennessee New Members 2019 Live coverage: Social media execs face grilling on Capitol Hill MORE of Tennessee and Sen. Orrin Hatch Orrin Grant HatchBottom line Bottom line Senate GOP divided over whether they'd fill Supreme Court vacancy MORE of Utah, to newcomers like Rep. Dave Trott David Alan TrottFormer GOP Michigan congressman says Trump is unfit for office Pro-Trump Republican immigrant to challenge Dem lawmaker who flipped Michigan seat Meet the lawmakers putting politics aside to save our climate MORE of Michigan, and most recently to Rep. Darrell Issa Darrell Edward IssaDCCC reserves new ad buys in competitive districts, adds new members to 'Red to Blue' program Wife of former Rep. Duncan Hunter sentenced to 8 months of home confinement Harris endorses Democrat in tight California House race MORE of California. So why are Republicans vacating their seats at a significantly faster rate than any other Congress in recent memory?

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Some Republican lawmakers have cited a desire to return to the private sector and spend more time with family. Others have announced gubernatorial bids or were forced out by scandal. One vague non-answer common among the departees emphasized that it was simply time to serve elsewhere. Other, however, have explicitly attributed the wave of retirements to an increasingly divisive and polarized political environment that has proliferated under the Trump presidency.

When Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE of Arizona announced his exit in October, he stated his purpose as “freeing myself of the political consideration that consumed far too much bandwidth,” and criticized President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE as “dangerous to our democracy.” Rep. Charlie Dent Charles (Charlie) Wieder DentRepublican former Michigan governor says he's voting for Biden Biden picks up endorsements from nearly 100 Republicans Bush endorsing Biden? Don't hold your breath MORE of Pennsylvania, who announced his decision in September, cited “increased polarization and ideological rigidity.”

As many in the media have correctly pointed out, a slew of these departures are from districts that narrowly carried the vote like Rep. Frank LoBiondo Frank Alo LoBiondoVan Drew wins GOP primary in New Jersey Amy Kennedy wins NJ primary to face GOP's Van Drew Stimulus price tag of .2T falls way short, some experts say MORE of New Jersey’s 2nd or Rep. Trott of Michigan’s 11th. They are also largely congregated on the East and West coasts in states like Washington and California, as well as Virginia and New Jersey.

These are the districts most vulnerable to repossession by Democrats, where the tightest races will be fought and the toughest questions asked of its Republican incumbents. These strategic vacancies represent an opportunity for Democratic lawmakers that, if properly leveraged, could potentially flip the House in their favor. Democrats need to secure just 24 seats to retake the majority from the Republicans-controlled House.

According to the Real Clear Politics average, Democrats now have an 11-point advantage in the generic ballot. A Quinnipiac University poll conducted earlier this month has that lead at 17 points. The poll, which asks voters whether they will vote Democratic or Republican for Congress, is historically a credible predictor of the House popular vote.

So how do Democrats translate this opening into a solid edge? Well, to begin with, they need an agenda beyond “resist Trump,” and a compelling message to convey it to the American people. Since its stunning 2016 defeat, the Democratic Party has expressed its desire to tap into the sentiments that won Donald Trump the presidential election.

First, however, Democrats must prove they value the concerns of the American people and explain how these issues will be resolved in language that resonates with ordinary citizens. Though the Democrats had every opportunity in 2017 to redefine their party and its message, intra-party bickering and indecision prevented progress.

Now is the time to building that agenda. In doing so, the Democratic Party must eschew the tendency to dissolve into an ideological debate that only pushes the centrist and progressive wings further into their respective corners in favor of a more populist appeal. Instead, they must put forward a set of pro-growth and inclusive economic policies. According to a January poll by the New York Times, 42 percent of Americans believe the national economy is better than it was a year ago.

Democrats should utilize this momentum and optimism to address several key issues. Increased infrastructure spending, affordable higher education and greater wage earnings are all traditional Democratic values that will resonate with American voters. Only once the Democratic Party sets a meaningful agenda can they begin to craft it into a compelling message that will resonate with the American people. They have shown they can stand up to Trump. Now they must prove they stand for something.

Douglas E. Schoen (@DouglasESchoen) served as a pollster for President Clinton. A longtime political consultant, he is also a Fox News contributor and the author of 11 books, including “Putin’s Master Plan: To Destroy Europe, Divide NATO, and Restore Russian Power and Global Influence.”