The Democratic field is now down to five. According to MSNBC, Mike Gravel - who was polling in last place across the board among the original eight Democratic candidates - announced he has exited the presidential race, joining Chris Dodd and Joe Biden from earlier this evening. No Republican has as of yet announced their departure from the race.
The Longest-Held Republican US Senate Seats
Curse of the '4'?
Big-name Republicans are not coming out of the woodwork yet to challenge Al Franken in Minnesota's 2014 U.S. Senate race, and there is not much chatter of the GOP picking off one of the five DFL-held U.S. House seats either. Over the last century, Minnesota Republican U.S. House candidates have not fared all that well in cycles ending in '4' - losing seats in five of these cycles (1914, 1924, 1944, 1954, 1974), holding serve in four others (1964, 1984, 1994, 2004), and gaining seats just one time (1934, after redistricting had been delayed one cycle with all nine seats voted at-large in 1932). Perhaps the Republican Party's best chance for a pick up in the Gopher State in 2014 is if 12-term Democrat Collin Peterson retires after nearly a quarter century on Capitol Hill. The 7th CD has the second largest GOP lean in the state.
Seasoned Senators in Wisconsin
Of the 15 men and women that have served in the U.S. Senate from Wisconsin since popular vote elections were introduced a century ago, Ron Johnson and Tammy Baldwin rank among the oldest upon first entering the chamber. Johnson began his tenure at the age of 55 years, 8 months, and 26 days in January 2011, which is the oldest of any elected Wisconsin Senator during this popular vote era. The next oldest, Alexander Wiley, was more than one year younger when he took his seat in 1939 (54 years, 7 months, 8 days). Tammy Baldwin comes in at #6 being 50 years, 10 months, and 23 days when she took office in January of this year. The youngest elected Senator from the Badger State was Robert La Follette, Jr. at 30 years, 7 months, and 24 days (1925) when he took the seat of his legendary deceased father.


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Not true!
MSNBC and, any other press reporting such, got it wrong.
Check the official Gravel for President site for more info, since an update to it clearly indicates that Mike Gravel is still in the race.