If the GOP takes the Senate and maintains the House and Romney is president, the Senate and House will move quickly on left leaning legislation because that’s what Romney will want. If Obama is president and the Senate and House are GOP then the GOP will put up some meek token opposition. If Romney wins and the Senate and House are Dim, Romney will do a lot of reach out and we’ll get more progressive crap too.
We’re screwed.
Basically, to keep divided government we need to maintain about 43-45 republicans in the Senate, given the rules of the Senate. If Romney gets non-supported, it will serve notice that conservatives aren’t messing around, and those senators will pretty much toe the line.
In terms of the House, maintaining control of the house would ensure divided government.