John McCain has largely stayed under the radar ever since he dramatically returned to the Senate floor to vote against the Republican-led health care repeal late last month. But he made a quick appearance Wednesday to thank supporters for their well-wishes following his brain cancer diagnosis.

“Thanks for your letters, thanks for your phone calls, thanks for your outpouring of affection,” McCain said in a brief video obtained by NBC News. “Even those that want me to die don’t want me to die right away, so that’s…