I spend abotu 100 a day on adwords and I get good quality sccores. I have a new campaign I am setting up. One of its ad groups is having impressions and ads showing. But another keyword is not. I've had it set up since last night. Why is this?
That keyword is probably just less popular? Either that or it's more popular and competitors are paying more than you. Give it another few days, and if it still isn't performing, delete it and replace it.
You can try increasing the max CPC for the adgroup where that keyword is listed to get things rolling. Then adjust it after you start seeing some impressions. What miakiru said is also possible.