The timeline below shows total mentions of Vice President Kamala Harris since being named as President Joe Biden's running mate. After being named the administration's immigration lead on March 24th, within days CNN and MSNBC all but stop mentioning her entirely, while Fox News increases its coverage of her. In recent days CNN and MSNBC have begun mentioning her again.
Zooming in to just this year, the shift in the days after March 24 is starkly visible.
In contrast, the timeline below shows mentions of Vice President Mike Pence over the same period from candidacy to four months in office, showing no similar major channel separation or zeroing out of mentions.