In its "Growth and Opportunity Project" report (another site here) the Republican National Committee candidly studies the party's setbacks:
The GOP today is a tale of two parties. One of them, the gubernatorial wing, is growing and successful. The other, the federal wing, is increasingly marginalizing itself, and unless changes are made, it will be increasingly difficult for Republicans to win another presidential election in the near future.
Republicans have lost the popular vote in five of the last six presidential elections. States in which our presidential candidates used to win, such as New Mexico, Colorado, Nevada, Iowa, Ohio, New Hampshire, Virginia, and Florida, are increasingly voting Democratic. We are losing in too many places.
It has reached the point where in the past six presidential elections, four have gone to the Democratic nominee, at an average yield of 327 electoral votes to 211 for the Republican. During the preceding two decades, from 1968 to 1988, Republicans won five out of six elections, averaging 417 electoral votes to Democrats’ 113.1
Public perception of the Party is at record lows. Young voters are increasingly rolling their eyes at what the Party represents, and many minorities wrongly think that Republicans do not like them or want them in the country. When someone rolls their eyes at us, they are not likely to open their ears to us.