Wolf Blitzer delivers the most important news and political stories of the day. Tune to The Situation Room weekdays 5-6:30pm ET on CNN.
By CNN's Wolf Blitzer
(CNN) - Remember all the negative attacks that Newt Gingrich, Rick Perry, Michele Bachmann, Ron Paul, Herman Cain and Rick Santorum leveled against Mitt Romney during the Republican primaries?
Many of those attacks were very nasty indeed.
It’s probably why we really haven’t seen those candidates aggressively campaigning for Romney since suspending their campaigns. The nerves are still raw.
And it’s probably also one reason why none of those candidates is likely to be on Romney’s short list for vice president.
My own sense is that the Republican candidate is looking for someone with whom he really feels comfortable – someone he genuinely trusts. I don’t think that’s the case for any of the earlier GOP candidates with one possible exception: former Minnesota Gov. Tim Pawlenty, who is now a national co-chairman of the Romney campaign.
Pawlenty was first runner-up four years ago when then-Republican candidate John McCain tapped Sarah Palin as his running mate. Pawlenty had been thoroughly vetted and really wanted to be on the ticket, but McCain went with the Alaska governor instead.
By the way, I suspect all those brutal attacks against Romney by the Republican presidential candidates will be child’s play compared with what we are going to hear from the Democrats in the coming months.
The Republicans, for their part, are gearing up for some tough and nasty campaigning of their own against President Barack Obama. They are going to portray him as an economic disaster – someone who will simply make matters even worse if re-elected. Romney has been hammering the president’s economic policy on the trail this week, and it will only get more intense as the election nears.
Follow Wolf on Twitter: @WolfBlitzerCNN