Hi Kelly Schmid,
That's a good start, but there is necessarily another module behind that integrates with webform on one end and with Marketo on the other. Could be (from most likely to the least likely):
In any case, if you are using one of these modules, you will not get the "fills out form" event and trigger in the lead activity.
If you are using Marketo MA, the best method is to create a Marketo custom field called "Filled Out Form" and map it with a hidden field in webform. For each Drupal webform, set a value for this field. When the lead is inserted or updated from Drupal, this field will receive a "change data value" event and you will be able to use the"Data Value changes" trigger to create any reaction you want in Marketo. The only rule is that you should always begin the "Data value changes" smart campaigns with a "Change Data Value" -> NULL flow step, otherwise you will not be able to detect if some fills out the same form twice in a row.
-Greg
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