The answers to the following clues will have something in common.

1. Not much hope for success
2. Wild guess
3. Nuptials under duress
4. Track and field event
5. Boost of support and encouragement
6. Be in charge
7. Very fast
8. Attempt
9. How things turn out in the end
10. Start of the Revolutionary War

Answers:

1. Longshot
2. Shot in the dark
3. Shotgun wedding
4. Shot put
5. Shot in the arm
6. Call the shots
7. Like a shot
8. Give it a shot 
9. Upshot
10. Shot heard round the world