When you easily sling around the R word, or any derivations thereof, you have lost all your credibility.
Whether you call them retarded or cognitively challenged the meaning is the same.
I have yet to hear any good arguments how term limits would make the legislative branch less reliant on Big Lobby. If anything, term limits do the opposite. Mandatory retirement at 70-ish would be far more effective.
That term limits are extremely popular with American voters is an indication of just how far gone our system is. Voters who favor term limits are effectively saying "I'm too stupid (retarded) to not vote for the same guy again so don't let me.
Your second point is even more important. Anyone who says they favor term limits, whether they like it or not, is saying that they want the lobbyists, beurecrats, and political parties to have MORE power.
Ohio enacted term limits and a lot of Republicans that I knew supported them because they desperately wanted to get rid of longtime Democratic State House Speaker* Vern Riffe.
Now Ohio's elected representatives have substantially less power and the buerecrats, lobbyists, and parties run the show.
The most meaningful way to increase representative democracy at the federal level is a substantial increase in the size of the House of Representatives.
One of my best friends has been pushing this argument since we were in High School. His argument is that elected officials who serve a district as large as a Congressional District (average population of 761K) cannot be defeated by a grassroots campaign so they inherently respond to lobbyists/money because that is what wins their elections.
He thinks the House should have 10x the current number of Representatives to get districts down to around 76K where he thinks they would be more responsive to voters.
*In those days it was typical for State House Speakers to be VERY powerful and hold their offices for decades. Another example is Willie Brown who was Speaker of the California House for most of two decades. Our current Vice President got her political start as Willie Brown's side chick.