Paul's link should put you on the right track. You still need to come up with a process to manually pull in polls and questions into Marketo if you want that information passed over to Sales. What we do is manually all their poll answers and questions into a single field in the spreadsheet, then upload that to a field called "Marketing Program Notes Import" that's Marketo-only. There is also a Marketo/CRM field called "Marketing Program Notes". You create a smart campaign that appends the info from your import field to your main field (with a date stamp) when the import field is updated. This is also a great practice for any notes field that could be updated multiple times, like a contact form open text field.

The cut off "new values" are

Choice 1: {{system.date}}: {{lead.Marketing Program Notes Import}}

Default: {{lead.Marketing Program Notes}} | {{system.date}}: {{lead.Marketing Program Notes Import}}