I stumbled across this while doing some Google searches this morning. The governor is buying ads on Google to tout his Web site, which asks for political contributions, even though he's already announced he's not running again.
Apparently they've been running for at least a week.
Based on our own knowledge of Googleads, playing around with various keywords (even if you just Google "governor," you get Pawlenty) and seeing various versions of the Pawlenty ad suggests it's a pretty extensive ad buy.
President Pawlenty, however are not one of the keywords for the ad. "Sarah Palin Tim Pawlenty" and "Mitt Romney Tim Pawlenty" are. "Barack Obama Tim Pawlenty" are not. "Minnesota budget" are.
I'm not sure how google adbuys work, exactly, but his ad has been showing up on the front page at MN Post for several days.
"2010 election" and "2012 election"
both bring up the ad as well.
I noticed this ad on my gmail account the same day that he announced that he isn't running for reelection. So even if you're not searching for something related, if you have MN-themed emails the governor wants to get to you.
I noticed it around the beginning of May. It's been going on for quite some time.