Soledad O’Brien will be wheeling her way through covering election night and promoting her new book, “The Next Big Story.” The CNN babe wrenched her knee when she was thrown off her horse this weekend on a ride with her daughters in upstate Brewster. “She pulled everything in her knee,” her rep said. “The doctor said it’s an injury a linebacker would have.” The reconstructive surgery will require six to eight weeks of recovery, but Soledad won’t cancel any upcoming reporting — she’ll be using wheelchairs and assistants to keep up.