Our data shows that 62.4 percent of article impressions were from sources rated by that research as left-leaning, whereas 11.3 percent were from sources rated as right-leaning. 26.3 percent of impressions were from news sources that didn’t have ratings
https://www.cjr.org/tow_center/google-news-algorithm.php
5.5x left to right ratio
Huge bias.