Eight of the 11 candidates to jump in the race before March are still on the campaign trail.
Fourteen states will be represented by a single party on Capitol Hill – seven Democratic and seven Republican; one party controls all but one seat in 13 other states.
No incumbent U.S. Senator has lost a primary in the First State and 33 of 35 incumbents have won renomination over the last century.
Only one region of the country is regularly seeing both parties win U.S. Senate seats in the vast majority of its states.
A Hatch retirement could give Romney the longest stretch between losing and winning U.S. Senate campaigns among major party nominees in the chamber’s history.
Maryland’s last close Senate election took place during Nixon’s first midterm with four other states also not hosting a competitive contest since the 1970s.
An average of seven senators have retired from the chamber each cycle during the past quarter-century; no incumbent up for reelection next year has yet closed the door on a 2018 bid.
Since the passage of the 17th Amendment all but seven states have been represented by a single party in the U.S. House and Senate for at least one Congress.
Connecticut has voted in concert with the region overall at a higher rate than any other Northeastern state since 1828; Maryland and Vermont have done so the least.
If a handful of toss-up races all end up in the Democratic column, the party will have its strongest showing in races for governor since its formation nearly 190 years ago.