Republicans for Rich, Democrats for Poor
The major difference between today's Republicans and Democrats is that Republicans favor the rich and the Democrats favor the poor. This is apparent from legislation Republicans advance - tax cuts anyone - to the legislation Democrats advance - spending to help the poor and infirm. Both the rich and the poor people in this nation know it, as can be seen from the following chart:
This diagram makes the distinction crystal clear. Majorities of those earning less than $50,000 vote for Democrats. Majorities of those earning $50,000 or more vote for Republicans. Furthermore, the poorer you are the more likely you are to vote for Democrats, and the richer you are the more likely you are to vote for Republicans.
The so-called polarization is the conflict between rich and poor. Every time a Democrat presents a case to help the poor, Republicans pounce and scream about class warfare. The above diagram tells you that there definitely is class warfare - and the rich are winning.
If you think this is wrong, join the Democratic Party.