Oh please. It's not. And the US is a representative republic....
The USA is a Representative Democracy, which means that if it also a republic, it would be a Constitutional Republic (like the USA)
If it were a (representative) Democracy and a Monarchy, it would be a Constitutional Monarchy (like Canada)
In a democracy everybody votes on everything....
No you're thinking of a Direct Democracy, which never existed in history (except at a small scale collective farm, workers collective factory or rock group etc) - it didn't really exist in ancient Greece either.
Democracy today is
Representative Democracy, where the people elect politicians to represent them (important to note that they are representatives, not delegates)
In the the US not one democratic election has ever been held. Our representatives do that for us...
That is because the USA is a Representative Democracy
And in actual fact, whilst the USA is not a direct democracy, it does actually exercise democratic votes (or plebiscites) more often than any other democracy, chiefly on non-political, single issue votes. eg: in my county a few years ago, the residents voted on whether the sale of alcohol on a Sunday should be allowed
And is not the selection of elected officials, including the president himself, not a democratic vote ?
Either the Senate should revert back to representing the states or it should be abolished. There is no reason for the nation to have two very expensive redundant groups representing the people.
A good argument can be made for abolition, however the Senate does fulfill several duties and represents a leveling of opinion across the country.
On balance I would retain it as it is.