First lady tweets 'I love you' to Obama for wedding anniversary

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Wednesday is the Obamas' 20th wedding anniversary, which they are spending in Denver for the first presidential debate.

Obama also tweeted on Wednesday that Michelle is "the love of my life and my best friend."

The first lady was in Reno, Nev., earlier in the day, but will be at the University of Denver on Wednesday night to watch the debate.

Obama's campaign posted a wedding photo of the couple on the president's Twitter feed.

Updated at 3:20 p.m.