Can a police search your car just because they smell marijuana?

yes but no

Explanation:

if they somehow can see it then yes. If they ask to search your car and then you say NO they can get a search warrant for the car. Or if they pull out the dog and he starts barking that's probable cause.

c. reserves power to the states and people

i believe that the answer to the question provided above is that the role of campaign committees is to act as a bridge between state and local campaigns.