While Republicans try to improve their performance with women, Hispanics and other voting groups where they've lost badly, they should also figure out a way to increase turnout among one group they almost always win - male voters.
Mitt Romney clobbered Barack Obama by a decisive 7 points among men, but women represented the big majority of voters, some 53%. If males had comprised 53% of the electorate, President Romney would be starting his second year in office.
Rapid improvements in male life expectancy have brought thirty years of steady increases in the male percentage of the population, closing the gap with women, but at the same time we've sharply declined as a percentage of presidential voters.
Bigger male turnout won't single-handedly turn the political tide , but it would cancel out a growing and often decisive Democratic advantage.