COLUMBIA, S.C. — Sen. Lindsey Graham of South Carolina tweeted Monday he has tested positive for coronavirus, months after he was vaccinated. The Republican senator said he started having flu-like symptoms Saturday night and went to the doctor Monday to be tested. Graham described his symptoms as "mild," and said his symptoms feel like he has a sinus infection. He tweeted he will quarantine for the next 10 days, and, despite his diagnosis, is glad he was vaccinated. "I was just informed by the House physician I have tested positive for #COVID19 even after being vaccinated. I started havin...