Answer:
We really can't write an essay for you, but we can make it easier...
You should already have a cause, for example: Universal Healthcare
And a government official that will support the cause, for example: Zoe Lofgren
Explanation:
You're also going to want some reasons/ evidence to support your cause
For example:
-healthcare.procon.org
-could save lives
-could stop medical bankruptcies
-improve public health
-improve economic productivity
Your 1st paragraph would be introducing the cause, and why you think it's important, why you chose it
Second could be evidence (like the ones above) as to why it's a good idea.
Third can be how it can be achieved, and closing statements.
good luck:)
Here's mine as an example. Super simple, only took about 20 minutes, but I got a good grade.