Anna Sale here on the day shift.

There are elections today in five states (Fla, Ariz, Ark., Vt, and Okla.), so we are getting ready for an exciting night of returns. We're reaching out to reporters and political thinkers to help us unpack the results and decipher any national threads to pull out — incumbent backlash, the fortunes of Tea Party-backed candidates, for example — but we also want to hear from voters about their motivations at the polls. If you're voting today, let us know what's on your mind as you make your choice.

The economic worries were no doubt already on the minds of most voters, and the dismal housing report out this morning certainly didn't help matters. We heard warnings this morning that the pace of U.S. home sales was expected to go down, but the reality ended up being even worse than expected. The figures were the lowest they've been in 15 years, which means of course, the slowest pace since long before the housing bubble burst. We're tracking the fallout and what it means for the larger economy.

We will also look at the strategy on the ground in Afghanistan as the last of the surge troops leave. Our parter, the BBC has been embedded with troops who will deploy tomorrow from Fort Campbell, Ky. We'll hear their voices and the latest on the mission before them.

We continue our series with Scientific American about endings — in nature, culture, and science. For most of human history the most blunt and clear ending in our lives was black and white. In recent decades, though, life support technology has made it much more gray. We'll talk with science writer Robin Marantz Henig and transplant surgeon Bill Pietra about how long to wait to harvest organs from patients who have lingering brain activity after their hearts stop beating. We also want to hear your stories about organ transplants. Let us know: If you are are an organ donor, what made you agree to it? If not, what's your reason against it?