Suggested campaign slogan: “Because Sam Brownback isn’t religious enough.”

After two previous runs for U.S. president, former Reagan diplomat Alan Keyes has announced he’s again seeking the White House in the 2008 election, and he’ll take part in Monday night’s Republican presidential debate here.

Keyes told syndicated radio host Janet Parshall he’s “unmoved” by the lack of moral courage shown by the other candidates, among whom he sees no standout who articulates the “key kernel of truth that must, with courage, be presented to our people.”

He added, “The one thing I’ve always been called to do is to raise the standard … of our allegiance to God and His authority that has been the foundation stone of our nation’s life” – and he decried the lack of “forthright, clear, and clarion declaration” from the current crop of presidential contenders.

With a little luck, he catches fire in South Carolina, sweeps to a surprise victory in Florida, rides the momentum to a shock running o’ the table on Super Ultra Mega Tuesday, and suddenly America gets the long-awaited general election rematch of the Illinois senate race three years ago that Keyes lost to Obama by, er, 43 points.

Exit question: Good news for Rudy? Keyes is only going to nibble at the most marginal margins in terms of popular support but he’s a good debater whose “values” cred is stronger than Fred’s and Mitt’s. Can he play Nader to their Gore in tight primaries in the south?