Pro-Romney Super PAC Restore Our Future takes aim at Santorum's "fiscal heresies" in Michigan, Arizona and Ohio: 

A similar version is running in the South. Needless to say, the Super PAC is going big

Restore Our Future will spend a total of $1.25 million in Michigan in the two weeks leading up to the state's February 28 primary; Romney's campaign is augmenting that with $617,000 in Michigan ads this week, though they haven't bought time next week yet. … Restore Our Future is also placing big advertising bets on Arizona ($121,000 this week, $493,000 next week); Ohio ($112,000 this week, $634,000 next week); Tennessee ($108,000 this week, $426,000 next week); Oklahoma ($36,000 this week, $199,000 next week); and Georgia ($119,000 this week, $554,000 next week. 

All told, the Romney-backing PAC is spending $5 million on television advertising over the next two weeks, an incredible amount usually reserved for the final days of a general election campaign, not a primary battle.

According to Rachel Weiner's reporting, there will be 29 times more Romney ads than Santorum ads running in Michigan. However, it appears that Santorum's PAC may rise to the occasion (we discussed the Santorum campaign's latest spot here). Finally, the WSJ reports that Shelly won't be cutting off Newt after all:

In a bit of political chess, Mr. Adelson is ready to not only directly support the former House speaker in the Republican primary, but to use his cash to push Rick Santorum from his position atop the latest national polls, according to people who have discussed the matter with Mr. Adelson.

Alex Burns reacts

[T]hat sounds a bit like the kind of thing you might say if you wanted to donate a couple million additional dollars to your friend Newt, without declaring open war on Mitt Romney and the GOP establishment. If Adelson wanted to help Romney dispatch Santorum, he could do that more easily by donating $10 million to … Mitt Romney. 

Winning Our Future will launch a national radio campaign tomorrow. Previous Ad War Updates hereherehere, here, here, here, here, here, here, here, here, here, here, here, here, here, here, here, here, here, here and here.