POTUS

• current snapshot
  • RealClearPolitics.com, see the "RCP Electoral Count" line (wikipedia) — averages recent polls to give a better picture
  • Electoral-Vote.com (Andrew Tanenbaum, wikipedia)
  • Election.Princeton.edu (Sam Wang) — meta-analysis
• forecast modelling (unlike current-snapshot sites, these try to filter temporary blips like the post-convention bounce, and otherwise try to factor in any expected changes between now and the actual day of polling)
  • FiveThirtyEight.com (Nate Silver, wikipedia)
  • Intrade state map
  • [2] [3] [4] [5]
• markets
  • Iowa Electronic Markets
  • Intrade (wikipedia) (though note that low volume allows people to manipulate the market price)
  • Washington Stock Exchange (categories of stocks)
  • BetFair.com
• blogs
  • pollster.com
• ostensibly neutral fact-checkers
  • politifact.com
  • factcheck.org

Key Senate races

• CQPolitics

OR: Merkley(D) vs. Smith(R)	MN: Franken(D) vs. Coleman(R)	GA: Martin(D) vs. Chambliss(R)
RealClearPolitics	RealClearPolitics	RealClearPolitics
Intrade	Intrade	Intrade
Electoral-Vote.com
FiveThirtyEight.com