Former Virginia Senator George Allen is expected to announce today that he will be running for the Senate once again. Allen lost his seat to Democrat Jim Webb in 2006 by less than 10,000 votes.

Update: this morning Allen sent a video message to his supporters announcing his 2012 candidacy for the US Senate.

One of the pivotal moments of that race, is of course the infamous “macaca moment,” where Allen was caught on camera using an ethnic slur to describe a Webb volunteer at a campaign stop. Allen apologized and maintained that he was not aware of the meaning of the word and said he never would have used it had he known its meaning.

Despite the apology, the incident had an impact on the race, which Allen eventually lost, ending any designs he had on a run for the White House in 2008.

Allen faces a potentially tough primary challenge from a Tea Party candidate, and given the environment, anything can happen.

Can George Allen become the latest political Lazarus and climb back into national prominence?