No, you can't do this directly but you should be able to accomplish this with either rules or a default value formula.
For default value formula: double-click on the node that is not bound to the control on the view and then click on the function button for the default value. Click Select a field or group button, select the other node, and click Ok several times.
For the rule (if the above is not available): double-click the control on the view, click Rules, click Add, make sure that there is no condition, name the rule something like "Update Secondary Node", click Add Action, select set a field's value.... I think you can take it from here.
Good luck!
Matt Faus / Microsoft InfoPath MVPQdabra® Software / Streamline data gathering to turn process into knowledge