Cenk Uygur was thrust onto the MSNBC schedule in January, when Keith Olbermann‘s departure set in motion several host changes on the progressive channel’s lineup. Now TVNewser hears Uygur may be moved out of the 6pm hour, possibly to be replaced by Al Sharpton. When the host changes happened earlier this year, the 6pm hour was simply known as “MSNBC Live,†a telling sign that MSNBC was trying out Uygur. Sharpton has hosted the 6pm show for the last two weeks. This past week, the hour was second, to Fox News, in A25-54 viewers Tuesday, Wednesday and Thursday.Insiders tell us...