President Obama's latest fundraising email pitch is tied to his upcoming birthday and the fact that he's getting older.

"When I decided to run for president, I had significantly fewer gray hairs than I do today," Obama writes to supporters. "Michelle says I've earned them, which is the nicest possible way to say I'm getting older. "In fact, I'm turning 51 in a couple weeks, and to celebrate I'm heading home to Chicago for a get-together at my house."

The subject of the email is "Gray hairs."

By donating to the campaign, one will be "automatically entered to join [Obama] at home in Chicago -- flight and hotel covered for you and a guest of your choice."

One can also enter the sweepstakes by not donating.

"Chicago is where I fell in love with my wife and where our daughters were born. It's where decades ago I first started as a community organizer and where, six years ago, I first talked with Michelle about the possibility of running for president," Obama writes.

I'm looking forward to spending a few hours celebrating there before it's all systems go for the final weeks of the election.

Should be fun.

Thanks for all your support so far. If you can, enter today for a chance to join me and some friends at my house in Chicago, and I can thank you in person.

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