When word surfaced that the 49ers were interested in Giants free agent quarterback David Carr as a backup for Alex Smith, Pro Bowl linebacker Patrick Willis was none too impressed.

"We have three quarterbacks that are better than [Carr]," Willis said on his Twitter page. "That's a waste of time." 

Ouch.

But now that Carr has signed a two-year deal to play for the 49ers, the linebacker has changed his tune.

"I heard that Carr signed," Willis tweeted. "He is my teammate now. Which means I'm all in for the guy. It's all about the team. Congrats and welcome aboard."

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Oh, well.

I will say this about Carr: After being around him during his two-year stint as Eli Manning's backup, he will be a big help for the 49ers, especially Smith. As a fellow former No. 1 overall pick who has fallen on hard times, Carr knows from firsthand experience what Smith is going through.

And Carr's optimism is not to be underestimated. The guy believes in himself, he's willing to hang around to get another shot, and my sense is he'll make the most of that chance, whenever it might come.