more evidence of polarization

As if it was needed:

Gallup lists the years with the largest gaps in presidential approval ratings between party members. Top years:

• G.W. Bush, Year 4
• G.W. Bush, Year 5
• G.W. Bush, Year 6
• Obama, Year 2
• G.W. Bush, Year 7
• Obama, Year 1
• Clinton, Year 4
• G.W. Bush, Year 8
• Reagan, Year 4
• G.W. Bush, Year 3

(While my first guess about these numbers is that they might reflect an increase in Independents, which would leave the parties naturally more polarized - that doesn't look like it's the case.)