From the very first day of this country the 5th estate took a very partisan position favoring the Agrarian, Pro-French, and States Right political camp over the Mercantile, Pro-English, and Central Government camp. In the short term this was very helpful for the Jeffersonian (left) side in prevailing over the Hamiltonian (right) side. This would increasingly change after the Civil War when both big government and big business would emerge.
Today the left continues to enjoy a huge main stream media advantage over the right and in the age of the internet that advantage has only increased. The creation of the social media mob will increasingly drive the USA from Socialism towards Marxism!