
Roll Call says that "sources close to Sanchez" say he'll announce tomorrow.
Sanchez will face former Congresswoman Heather Wilson in the Republican primary. Two other GOP candidates, Greg Sowards and Bill English, also have declared.
On the Democratic side, Congressman Martin Heinrich faces State Auditor Hector Balderas. Dark horse Dem Andres Valdez also has declared he's running.
Sanchez Senate Declaration