It needs to be spelled out to you, so here you go: It’s unacceptable in American politics to run against a federal incumbent without a) significant reason (age is not a reason) and b) significant backing (because the national party won’t support you).
But thanks for parroting the right-wing bullshit about decline, which I suppose was your real reason for posting. PS I’ll bitch about third party voters all I fucking want - a centrist or left-leaning voter casting a ballot for a third party is really casting half a vote for Trump and they should be fucking shunned. Vote your heart in the primary but vote for the team in the general.
In related news, The boogeyman, Sasquach, and Godzilla are also forbidden to enter Tennessee. The rainbow has been officially reclaimed from the homosexuals that stole it from God, but the bill to build a wall to keep out the gay frogs died in committee over funding issues (Mexico refused to pay for it).