Republicans this year have pushed more female candidates to run for Congress in a bid to appeal to single, white women and minority voters and gain traction over the Democrats.

Democrats' last line of defense against the Republicans includes minority voters and the single, white women. This is why Republicans have five female candidates for the Senate and 50 female candidates for Congress, according to Fox News.

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In the past, minority voters have been less likely to vote during midterm polls than in presidential elections. So, Democrats are now turning their attention on those who are more likely to participate in the polls such as college-level individuals and single women.

Nicole McCleskey, a Republican employee for polling firm Public Opinion Strategies, told National Journal that in 2004, the average gender gap in both senatorial and gubernatorial elections was 13 points. This year, however, the gender gap for both races has risen to 20 points.

Compared to the 2012 polls, exit surveys showed U.S. President Barack Obama's victory was spurred on by support from 55 percent of female voters who favoured him over Republican rival Mitt Romney.

Interestingly, Democrats have recently altered their "War on Women" strategy by renewing their focus on the Violence Against Women Act, equal pay issues, minimum wage hike, and opposition to more access to contraception and other components of the Affordable Care Act.

Female Republican contenders cannot deny the fact that their comrades in Congress have voted to repeal the Affordable Care Act several times. In addition, state legislatures dominated by Republicans have are also shutting down abortion clinics through stricter anti-abortion laws.

Democratic pollster Stan Greenberg found that the Democrats are effectively winning over voters because of their campaigns that are centered the economy and women's issues.

For Republicans, their best hope for defeating the rival party is to push strong female contenders to run this year. This is why their lineup, which was previously dominated by males, now includes Iowa's Joni Ernst, West Virginia's Shelley Moore Capito, Oregon's Monica Wehby and Michigan's Terri Lynn Land.

This year, some generic surveys showed women voters generally prefer Republicans rather than Democrats to dominate Congress. This pushed Republicans to run ads that feature the mothers, wives and daughters of their male runners.

One example is Land's television ad wherein she talks about women issues. Looking straight at the camera, she also explains why voters should choose her over her male opponent.

"As a woman, I might know a little bit more about women than Gary Peters," Land said in the ad.

TagsSingle white women, Republicans, Democrats, U.S. election, midterm election, Senate, Congress