What if ex Presidents often served in Congress

So far John Quincy Adams is the only former US president to have served in congress. How would American government be different if after his example this became a common occurrence?
 
Almost a pre-requitisite for this to occur is that Party discipline be even weaker than it was OTL. An ex-President will have a huge amount of independent influence and little need to kowtow to the Speaker or Party leadership to gain Committee seats and the like. After the Civil War, this would be very difficult because the Speaker (typified by Joseph Cannon) was very power (more so than at any other time in history). It would perhaps be less disrupting if Presidents served in the Senate, being selected by their state legislatures.

A two-term President has already voluntarily decided not to seek a third term and so has given up power. He's also probably fairly old and unless he has a firm seat in Congress has little incentive to campaign or spend the amount of time required to go back and forth from DC to his district.

Furthermore, most Presidents have to "spend political capital" when they're in office. A euphamistic way of saying they make enemies, enemies who tend to be in Congress. So why would they want to go back to a body which they had had to fight at times and in which they would not be welcome. A one-term President has been defeated in election and usually is not well regarded by his Party, so again why would people want him in Congress.

JQA had to overcome / deal with all of the above.

It might be more feasible if Congress decided to give ex-Presidents honorary seats (but not votes), giving Presidents speaking and committee privileges. Again, there's still the problem that most Presidents in the 19th century were quite old and / or had major political enemies in Congress when they left office.
 
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