Sen. Mark Udall (D) conceded to Rep. Cory Gardner (R) in Colorado Tuesday night. Critics argued Udall's campaign put too much focus on women's issues as the race tightened. (KMGH)

For the "war on women" message to actually be effective for Democratic candidates, one key thing has to happen: Women have to show up and vote for Democrats in larger numbers than men. In Colorado, that didn't happen for Sen. Mark Udall.

Women were 48 percent of the electorate, their lowest share since 1992, according to Rick Klein over at ABC News.


Udall won women by 9 points over Sen.-elect Cory Gardner (R), but it wasn't enough to overcome the 16-point advantage that Gardner had with men — especially considering that men were a larger share of the electorate. Udall focused heavily on women's issues in his campaign, running ads on contraception and abortion. So much so that he was seen as a single-issue candidate and earned an unfortunate nickname.

Same goes for Georgia.  Michelle Nunn did well among women, but not enough to offset David Perdue's strong showing among men.  One question Democratic and Republican pollsters will be chewing over is whether Democrats' edge with women is becoming only a presidential-cycle bump.  In 2010, Democrats split women with Republicans and didn't see large enough margins among unmarried women.  But in 2012, the typical edge reappeared, with President Obama winning women by 13 points.

Rep. Cory Gardner (R) defeated Sen. Mark Udall (D) in Colorado on Tuesday, proving a Republican can win in a purple state that has trended blue in recent elections. (KMGH)