Mitt Romney is within striking distance of President Obama in Michigan and Pennsylvania, according to polls conducted soon after last week's debate. 

Obama leads Romney 43 percent to 40 in a new Siena College poll of Pennsylvania, a tighter margin than had been seen in most other recent polls. 

A Susquehanna Poll released on Monday had Romney within 2 points in the state. The margin was unchanged from a late September poll by the group that was taken when other surveys showed Obama with a double-digit lead in Pennsylvania. 

In Michigan, Obama's lead over Romney is down to 3 points in two new polls. An EPIC-MRA poll has Obama leading by 48 to 45 percent, down from a 10-point lead less than a month ago. That 3-point edge mirrors the numbers in a new poll from the Democratic firm Baydoun-Foster, but partisans on both sides of the aisle view have questioned that pollster's reliability, and its poll from a month ago had Romney within 2 points in the state.

Neither candidate has spent anything in either state in the last few months, though the pro-Romney super-PAC Restore Our Future has been on the airwaves intermittently in Michigan and Paul Ryan had a campaign event there on Monday, the first for a major Romney surrogate in recent weeks.

It's too early to tell if these polls are just a blip on the radar or if they represent an actual shift in voters' perceptions of the candidates in those states, and with a month left it might be too late for Romney to make a major push in new territory. But the states likely represent Romney's best hopes of expanding a tight electoral map and giving himself more pathways to victory in November.

This post was updated at 9:40 a.m.