The Dems view Allen as a serious candidate for President in 2008. His Reaganesque appearance and ability to relate to people make him a strong foe. They don't want this young former Southern governor and college quarterback with a famous sports name to be their opponent. Also, Allen did a tremendous job in running the 2004 GOP National Senatorial campaign.
The New Republic, NYT, and WP have been running concerted attacks against Allen since May. This has more to do with just a Senate seat. It is about character assassination of a possible Rep presidential candidate.
While the NYT, WaPo, and their allies view this as a two-fer (getting both the Senate seat and marginalizing Allen for the presidency), WE need to keep our eyes on the immediate effects of this attack. I don't really have a favorite in the presidential race, seeing both pluses and minuses in all of the candidates (except for McCain, who is nothing BUT a walking minus), but I support Allen wholeheartedly in this Senate race. Webb is revealing himself as a despicable individual and an opportunist. He doesn't deserve this win, and I am afraid that if people from our side keep sniping at Allen, he will lose enough supporters that he might lose the race, which would be really unfortunate.