Democrats seek to close the 'God Gap'

The 2004 election gave the Democrats a serious wake-up call. Polls revealed religion as a striking predictor of voting behaviour - the more often a voter attended church, the more likely they were to vote for President Bush, by a wide margin. In a nation where more than 90% believe in God, that is not a good thing for the Democrats. So now it is not only Republicans but Democrats who are talking about their faith.
The Democrats are supporting candidates like Bob Casey, who is running in for the Senate in Pennsylvania. Like his Republican rival Rick Santorum, he describes himself as a "pro-life Catholic".
...Meanwhile for the last 20 years the religious right has, with great success, portrayed God as a Republican. But in the wake of sexual and corruption scandals, evangelical enthusiasm for the Republicans has dropped, and the Democrats see an opportunity to bridge what has been dubbed the "God Gap". And they have come up with a new mantra, the Common Good.
...candidates like Bob Casey are hoping that the Common Good will do for them what Compassionate Conservatism did for President Bush six years ago. That slogan has dropped off the radar. It remains to be seen whether the Common Good - around for centuries in Catholic thought - has a longer shelf life for the Democrats.

— Jane Little, BBC News, Washington